Chehalis River is a river and river system located wholly within the state of Washington in the United States. The Chehalis River has a 2,660 square-mile (6,840 square-km) drainage basin located between Aberdeen, Washington and the Willapa Hills. This includes the entire Chehalis River watershed but not the Grays Harbor estuary. The river is roughly 108.2 miles (175.29 km) in total length not counting tributaries.
The Chehalis River is the largest river system located entirely within Washington state. Only the Columbia River located in British Columbia, Washington, and Oregon is larger.
The Chehalis is a little off the beaten path as one of the few whitewater runs in the southwest corner of the state, but it serves up some great whitewater for a wide range of interests.
River cruisers who want to get in a good workout can enjoy up to 15 miles of continuous whitewater, intermediate paddlers can find several fun sections with only a couple portages, experts can find a couple very challenging drops, and playboaters can find several fun features.
The river forms at the confluence of the west and east forks, and from this point to the first bridge downstream the river flows at a lazy pace through continuous class II rapids.
Fry are reared to 2 grams and then released from the hatchery into the ChehalisRiver in mid to late April.
In addition to Chehalis steelhead, Coquihalla summer-run steelhead are also reared at the hatchery for one year and then released back into the Coquihalla River near Hope.
ChehalisRiver gravity feed, riverbank fixed-screen intake- supplies 25,000 to 50,000 lpm (15-30 cfs) of river water depending on water demand.